diff --git a/mach.bat b/mach.bat
index 077bd574083..a270b583801 100644
--- a/mach.bat
+++ b/mach.bat
@@ -36,4 +36,9 @@ IF EXIST "%VS_VCVARS%" (
 
 popd
 
-python mach %*
+where /Q py.exe
+IF %ERRORLEVEL% NEQ 0 (
+  python mach %*
+) ELSE (
+  py -2 mach %*
+)